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Finding the Fourth Proportional to 128,666.28, 192,990.12 and 39,917.46

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Solution

The fourth proportional to 128,666.28, 192,990.12 and 39,917.46 is: 59,873.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,666.28 : 192,990.12 = 39,917.46 : x
  2. Step 2: Convert to fraction form
    128,666.28/192,990.12 = 39,917.46/x
  3. Step 3: Cross multiply
    128,666.28x = 192,990.12 × 39,917.46
  4. Step 4: Simplify right side
    128,666.28x = 7,703,675,395.50
  5. Step 5: Solve for x
    x = 7,703,675,395.50/128,666.28
  6. Step 6: Final answer
    x = 59,873.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.